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Human papillomavirus (HPV) infections pose serious medical problem. To date, there are no HPV-specific antivirals available due to poor understanding of the molecular mechanisms of virus infection cycle. The infection cycle of HPV involves initial amplification of the viral genomes and maintenance of the viral genomes with a constant copy number, followed by another round of viral genome amplification and new viral particle formation. The viral protein E1 is critical for the initial amplification of the viral genome. However, E1 involvement in other phases of the viral life cycle has remained controversial. In the present study, we show that at least two different replication modes of the HPV18 genome are undertaken simultaneously during the maintenance and vegetative amplification phases, i.e., replication of the majority of the HPV18 genome proceeds under the control of the host cell replication machinery without E1 function, whereas a minority of the genome replicates in an E1-dependent manner.

Uncovering the Role of the E1 Protein in Different Stages of Human Papillomavirus 18 Genome Replication